Definition

A severe and potentially life-threatening allergic reaction that occurs rapidly after exposure to an allergen, such as certain foods, medications, or insect stings.

Example

The patient experienced anaphylaxis after eating peanuts, requiring immediate medical attention.

Conversation

Have you ever heard of anaphylaxis before?

Yeah, I think it’s a serious allergic reaction, right?

Exactly! It can happen really quickly after exposure to allergens.

That sounds pretty scary; I’m glad I don’t have any severe allergies.

Synonyms & Antonyms

Root Explanation

Anaphylaxis → It is formed from "ana-" (meaning against) and "phylaxis" (from Greek "phylaxia", meaning protection). The term describes a severe reaction that is against the body's normal protective responses.

Memory Tip

Think of 'against' ('ana-') the body's 'protection' ('phylaxis') — that's why anaphylaxis refers to a severe reaction that opposes the body's usual defenses.

Visually Confused Words